"""API for SolarEdge Web."""

from __future__ import annotations

import dataclasses
from datetime import datetime
from enum import IntEnum
from http.cookies import Morsel
import json
import logging
import time
from typing import Any

import aiohttp

_LOGGER = logging.getLogger(__name__)


class TimeUnit(IntEnum):
    """How long ago to return energy data."""

    # Only DAY and WEEK actually return data.
    # ALL = 0
    # MINUTE = 1
    # QUARTER_OF_AN_HOUR = 2
    # HOUR = 3
    DAY = 4
    WEEK = 5
    # MONTH = 6
    # YEAR = 7
    # QUARTER_OF_A_YEAR = 8


@dataclasses.dataclass
class EnergyData:
    """Data as reported by the API for a single timestamp."""

    start_time: datetime
    values: dict[int, float]  # Dict from equipment ID to production energy in Wh


class SolarEdgeWeb:
    """SolarEdge Web client."""

    def __init__(
        self,
        username: str,
        password: str,
        site_id: str,
        session: aiohttp.ClientSession,
        timeout: int = 10,
    ) -> None:
        """Initialize the SolarEdge Web client."""
        self.username = username
        self.password = password
        self.site_id = site_id
        self.session = session
        self.timeout = aiohttp.ClientTimeout(total=timeout)
        self._equipment: dict[int, dict[str, Any]] = {}
        self._last_login_time = 0.0

    async def async_login(self) -> None:
        """Login to the SolarEdge Web."""
        sso_cookie = self._find_cookie("SolarEdge_SSO-1.4")
        if (
            sso_cookie is not None
            and time.time() - self._last_login_time
            < int(sso_cookie["max-age"]) - 10 * 60
        ):
            _LOGGER.debug("Skipping login. Using existing valid SSO cookie")
            return
        self._equipment = {}
        url = "https://monitoring.solaredge.com/solaredge-apigw/api/login"
        try:
            resp = await self.session.post(
                url,
                headers={"Content-Type": "application/x-www-form-urlencoded"},
                data={"j_username": self.username, "j_password": self.password},
                timeout=self.timeout,
            )
            _LOGGER.debug("Got %s from %s", resp.status, url)
            resp.raise_for_status()
        except aiohttp.ClientError as err:
            _LOGGER.error("Error during SolarEdge login: %s", err)
            raise
        self._last_login_time = time.time()

    async def async_get_equipment(self) -> dict[int, dict[str, Any]]:
        """Get the equipment of the SolarEdge installation.

        Returns a dict of {equipment_id: equipment_data}
        """
        _LOGGER.debug("Fetching equipment for site: %s", self.site_id)
        await self.async_login()
        if self._equipment:
            _LOGGER.debug(
                "Using cached %s equipment for site: %s",
                len(self._equipment),
                self.site_id,
            )
            return self._equipment
        url = f"https://monitoring.solaredge.com/solaredge-apigw/api/sites/{self.site_id}/layout/logical"
        try:
            resp = await self.session.get(url, timeout=self.timeout)
            _LOGGER.debug("Got %s from %s", resp.status, url)
            resp.raise_for_status()
        except aiohttp.ClientError as err:
            _LOGGER.error("Error fetching equipment from %s: %s", url, err)
            raise
        resp_json = await resp.json()

        def extract_nested_data(
            node: dict[Any, Any], data_dict: dict[int, dict[str, Any]]
        ) -> None:
            item_data = node["data"]
            data_dict[item_data["id"]] = item_data
            for child_node in node["children"]:
                extract_nested_data(child_node, data_dict)

        self._equipment = {}
        for top_level_child in resp_json["logicalTree"]["children"]:
            extract_nested_data(top_level_child, self._equipment)
        _LOGGER.debug(
            "Found %s equipment for site: %s", len(self._equipment), self.site_id
        )
        return self._equipment

    async def async_get_energy_data(
        self, time_unit: TimeUnit = TimeUnit.WEEK
    ) -> list[EnergyData]:
        """Get energy data from the SolarEdge Web API.

        Energy data is aggregated by 15 minutes, with energy values in Wh.
        """
        _LOGGER.debug("Fetching energy data for site: %s", self.site_id)
        await self.async_login()
        csrf_token_cookie = self._find_cookie("CSRF-TOKEN")
        if csrf_token_cookie is None or not csrf_token_cookie.value:
            _LOGGER.error("CSRF-TOKEN not found in cookies")
            raise aiohttp.ClientError("CSRF-TOKEN not found in cookies")
        url = "https://monitoring.solaredge.com/solaredge-web/p/playbackData"
        try:
            resp = await self.session.post(
                url,
                headers={
                    "Content-Type": "application/x-www-form-urlencoded",
                    "X-CSRF-TOKEN": csrf_token_cookie.value,
                },
                data={"fieldId": self.site_id, "timeUnit": time_unit.value},
                timeout=self.timeout,
            )
            _LOGGER.debug("Got %s from %s", resp.status, url)
            resp.raise_for_status()
        except aiohttp.ClientError as err:
            _LOGGER.error("Error fetching energy data from %s: %s", url, err)
            raise
        resp_text = await resp.text()
        # The API returns a JavaScript object string, convert it to strict JSON.
        # An alternative would be to use JSON5 but it's too slow
        resp_text = (
            resp_text.replace("'", '"')
            .replace("timeUnit:", '"timeUnit":')
            .replace("fieldData:", '"fieldData":')
            .replace("fieldDataArray:", '"fieldDataArray":')
            .replace("reportersData:", '"reportersData":')
            .replace("key:", '"key":')
            .replace("value:", '"value":')
        )
        resp_json = json.loads(resp_text)
        energy_data = [
            EnergyData(
                start_time=datetime.strptime(date_str, "%a %b %d %H:%M:%S GMT %Y"),
                values={
                    int(entry["key"]): float(entry["value"])
                    for entries_list in d.values()
                    for entry in entries_list
                },
            )
            for date_str, d in resp_json["reportersData"].items()
        ]
        _LOGGER.debug(
            "Found %s energy data for site: %s", len(energy_data), self.site_id
        )
        return energy_data

    def _find_cookie(self, name: str) -> Morsel | None:
        """Find a cookie by name."""
        for cookie in self.session.cookie_jar:
            if cookie["domain"] == "monitoring.solaredge.com" and cookie.key == name:
                return cookie
        return None